Program e01aafe

!     E01AAF Example Program Text

!     Mark 27.3 Release. NAG Copyright 2021.

!     .. Use Statements ..
      Use nag_library, Only: e01aaf, nag_wp
!     .. Implicit None Statement ..
      Implicit None
!     .. Parameters ..
      Integer, Parameter               :: nin = 5, nout = 6
!     .. Local Scalars ..
      Real (Kind=nag_wp)               :: x
      Integer                          :: i, j, k, n, n1, n2
!     .. Local Arrays ..
      Real (Kind=nag_wp), Allocatable  :: a(:), b(:), c(:)
!     .. Executable Statements ..
      Write (nout,*) 'E01AAF Example Program Results'

!     Skip heading in data file
      Read (nin,*)

      Read (nin,*) n, x
      n1 = n + 1
      n2 = n*(n+1)/2
      Allocate (a(n1),b(n1),c(n2))

      Read (nin,*)(a(i),i=1,n1)
      Read (nin,*)(b(i),i=1,n1)

      Call e01aaf(a,b,c,n1,n2,n,x)

      Write (nout,*)
      Write (nout,*) 'Interpolated values'

      k = 1

      Do i = 1, n - 1
        Write (nout,99999)(c(j),j=k,k+n-i)
        k = k + n - i + 1
      End Do

      Write (nout,*)
      Write (nout,99998) 'Interpolation point = ', x
      Write (nout,*)
      Write (nout,99998) 'Function value at interpolation point = ', c(n2)

99999 Format (1X,6F12.5)
99998 Format (1X,A,F12.5)
    End Program e01aafe